Why Capacitors allow AC signals? | Electronics 101

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Even though capacitors are very simple devices, they are not usually fully understood. This will make it difficult to analyze circuits with capacitors, excited by AC signals. In this video, I have explained how capacitors allow AC signals, even though they are an open circuit.

If you find it difficult to understand my accent, please turn on the captions.

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This helped me a great deal! I now understand how the AC signal passes through the capacitor! It really like as
the electrons accumulate by the AC signal pushing electrons towards ONE capacitor's plate (A)...that plate (A)
then has an excessive amount of electron on it's plate! The excessive amount of electrons on that plate (A) is
FELT "electrostatically" (by the close proximity) on the other plate (B). The electrons on plate (B) are then repelled
by the excessive electrons on plate (A) and moves away from plate (B)...AT THE SAME RATE THAT THE ELECTRONS
ON PLATE (A) are being pushed towards and pulled away from plate (A) by the AC Signal. Thus is "seems" the signal
is being passed thru to Plate (B) because plate (B) is mimicking the exact rate (frequency) of the AC signal experienced
by plate (A). Then whatever is attached to Plate (B) sees that AC signal that is actually on Plate (A). Whether that signal
goes ground, or used to control an amplifier...it can be directed "onward" as needed!

jeffharrison
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You made this seem so simple that I'm almost suspicious of whether it's actually true. Great explanations - please keep it up!

jazzyj
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Thank you for your great educational lessons

I have question please : i am confused how we can write : Vs= Vc knowing that the capacitor "gradualy" raise its voltage and doesnt respond instantaneously with the voltage source !, why we are ignoring this fact and treating capacitor as if it is a resistor ?

Thank you in advance

mohfa
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I think changing magnetic field will induce emf in another plate there by resulting in electron flow in the another plate

nikolatesla